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CS551: ISP Peering Norton01

CS551: ISP Peering Norton01. Christos Papadopoulos ( http://netweb.usc.edu/cs551/). Definitions. Peering: Provide connectivity to each others’ customers Non-transitive relationship Transit: One ISP sells transit to another ISP Tier-1 ISP: Has access to global routing table

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CS551: ISP Peering Norton01

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  1. CS551:ISP PeeringNorton01 Christos Papadopoulos (http://netweb.usc.edu/cs551/)

  2. Definitions • Peering: • Provide connectivity to each others’ customers • Non-transitive relationship • Transit: • One ISP sells transit to another ISP • Tier-1 ISP: • Has access to global routing table • Does not purchase transit from anyone

  3. Why Peer? • Reduced cost • Buying transit is expensive • Reduced latency • Reduced number of hops

  4. Why Not Peer? • Traffic asymmetry • Potential transit sale • Peering consumes resources • Staff, router cards, etc • Maintain exclusivity • Peering makes both ISPs stronger • Peering relations have less contractual teeth

  5. Decision Phases • Phase 1: Identify peer • Phase 2: Contact potential peer • Phase 3: Agree on peering methodology

  6. Phase 1: Identify Peer • Traffic engineering, data collection and analysis • Technical, business and legal issues • Intuition • Broader business arrangements (CEO’s play golf together) • Peering policies (open, exclusive)

  7. Phase 2: Contact Peer • Find the right person! • Sign NDA (optional) • Share traffic stats

  8. Phase 3: Peering Methodology • Direct v.s. exchange-based • Cost sharing • Split equally • I will peer with you if you pay all the cost

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